Chem 1010 - General Chemistry 1 » Summer 2022 » Quiz 3

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Question #1
Which of the following is an example of potential energy?
A.   electrons flowing through an electrical conductor
B.   atoms vibrating back and forth around a specific location
C.   a rock rolling down a mountain
D.   a fat molecule stored in the body
Question #2
How many kilojoules are there in 150 Calories of popcorn?
A.   36 J
B.   3.6 × 104 J
C.   3.6 × 10−2 J
D.   630 J
Question #3
The First Law of Thermodynamics states that:
A.   the total energy of the universe in constant.
B.   the total entropy of the universe is increasing.
C.   molecules move faster as temperature increases.
D.   energy transfers from hotter objects to cooler objects.
Question #4
Which sample would have the highest average kinetic energy?
A.   All samples would possess the same average kinetic energy.
B.   H2O(l) at 55°C
C.   H2O(g) at 110°C
D.   H2O(s) at -25°C
Question #5
Heating a 25.0 g sample of each substance below with 375 J of energy will cause which substance to have the greatest increase in temperature?
A.   copper (specific heat = 0.385 J g−1 °C−1)
B.   iron (specific heat = 0.451 J g−1 °C−1)
C.   gold (specific heat = 0.128 J g−1 °C−1)
D.   water (specific heat = 4.184 J g−1 °C−1)
Question #6
How much energy is required to raise the temperature of 200.0 g of water by 25.0°C?
A.   9.36 kJ
B.   210 kJ
C.   1200 kJ
D.   20.9 kJ
Question #7
Heating a 50.0 g sample of iron (specific heat = 0.451 J g−1 °C−1) raises its temperature from 25.0°C to 79.4°C. How much energy was required to heat the sample?
A.   1230 J
B.   2.41 J
C.   564 J
D.   1790 J
Question #8
Based on the following thermochemical equation, which statement is false? NH3(l) → NH3(g) H° = +23.4 kJ
A.   The thermochemical equation represents a physical change.
B.   The enthalpy change for the gas condensing into a liquid is known.
C.   The internal energy of the surroundings increases
D.   The enthalpy change is endothermic.
Question #9
When does an endothermic reaction occur?
A.   when the energy of bonds breaking is greater than the energy of bonds formed
B.   when bonds are formed
C.   when the energy of bonds breaking is less than the energy of bonds formed
D.   when stronger bonds are formed and weaker bonds are broken

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